I would go a bit deeper and teach them proper breathing. When you can control your breathing you can control your mindset, and when you can control your mindset you can master distance, timing, and killer instinct, as well as maintain fluidity.

If anyone of you has really studied your literature you would recognize this quote from Beowulf "Fortune favors a man often enough if his courage holds" T win in Kumite competition you must first realize that because we don't play karate of shaolin kenpo, or Judo we fight, everyone will be a bit nervous , the key to success is realizing that you are nervous and so is your opponent. GUTS is 75% of fighting, that is provided you have trained properly. The other key is to realize that for the vast majority of students you will never make a living as a tournament competitor, and if you make a living as a Martial Arts instructor which is the dream of many practitioners, no student will ever ask you what your tournament record happened to be as a brown belt. So don't take it too seriously it is not life and death, and win or lose it will probabally not affect your life either way.